word usage - Do "multiple choice" questions always have only one correct answer?


In most dictionary definitions it seems that "multiple choice" questions actually refer to questions where only one "correct" answer among several choices is expected to be chosen (e.g. the definition from Oxford Dictionary and Wikipedia (Not such a good source, I know). However, some other sources online purport that "one or more answer choices" can also be allowed under "multiple choice" questions (e.g. the description of the GRE exam).


What would be the correct interpretation of "multiple choice" here? Is there any regional variation at play? If it mostly refers to questions with exactly one correct answer, how should the questioner avoid misunderstanding if the question explicitly expects more than one answers to be chosen?




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